1 files changed, 36 insertions, 6 deletions

diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h
index 77c6497f416e..47bc1ffa3d4c 100644
--- a/include/asm-i386/pgtable.h
+++ b/include/asm-i386/pgtable.h
@@ -86,9 +86,7 @@ void paging_init(void);
 #endif
 
 /*
- * The 4MB page is guessing..  Detailed in the infamous "Chapter H"
- * of the Pentium details, but assuming intel did the straightforward
- * thing, this bit set in the page directory entry just means that
+ * _PAGE_PSE set in the page directory entry just means that
  * the page directory entry points directly to a 4MB-aligned block of
  * memory. 
  */
@@ -119,8 +117,10 @@ void paging_init(void);
 #define _PAGE_UNUSED2   0x400
 #define _PAGE_UNUSED3   0x800
 
-#define _PAGE_FILE      0x040   /* set:pagecache unset:swap */
-#define _PAGE_PROTNONE  0x080   /* If not present */
+/* If _PAGE_PRESENT is clear, we use these: */
+#define _PAGE_FILE      0x040   /* nonlinear file mapping, saved PTE; unset:swap */
+#define _PAGE_PROTNONE  0x080   /* if the user mapped it with PROT_NONE;
+                                   pte_present gives true */
 #ifdef CONFIG_X86_PAE
 #define _PAGE_NX        (1ULL<<_PAGE_BIT_NX)
 #else
@@ -215,11 +215,13 @@ extern unsigned long pg0[];
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
  */
+#define __LARGE_PTE (_PAGE_PSE | _PAGE_PRESENT)
 static inline int pte_user(pte_t pte)           { return (pte).pte_low & _PAGE_USER; }
 static inline int pte_read(pte_t pte)           { return (pte).pte_low & _PAGE_USER; }
 static inline int pte_dirty(pte_t pte)          { return (pte).pte_low & _PAGE_DIRTY; }
 static inline int pte_young(pte_t pte)          { return (pte).pte_low & _PAGE_ACCESSED; }
 static inline int pte_write(pte_t pte)          { return (pte).pte_low & _PAGE_RW; }
+static inline int pte_huge(pte_t pte)           { return ((pte).pte_low & __LARGE_PTE) == __LARGE_PTE; }
 
 /*
  * The following only works if pte_present() is not true.
@@ -236,7 +238,7 @@ static inline pte_t pte_mkexec(pte_t pte)	{ (pte).pte_low |= _PAGE_USER; return
 static inline pte_t pte_mkdirty(pte_t pte)      { (pte).pte_low |= _PAGE_DIRTY; return pte; }
 static inline pte_t pte_mkyoung(pte_t pte)      { (pte).pte_low |= _PAGE_ACCESSED; return pte; }
 static inline pte_t pte_mkwrite(pte_t pte)      { (pte).pte_low |= _PAGE_RW; return pte; }
-static inline pte_t pte_mkhuge(pte_t pte)       { (pte).pte_low |= _PAGE_PRESENT | _PAGE_PSE; return pte; }
+static inline pte_t pte_mkhuge(pte_t pte)       { (pte).pte_low |= __LARGE_PTE; return pte; }
 
 #ifdef CONFIG_X86_PAE
 # include <asm/pgtable-3level.h>
@@ -258,12 +260,39 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned
         return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte_low);
 }
 
+static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
+{
+        pte_t pte;
+        if (full) {
+                pte = *ptep;
+                *ptep = __pte(0);
+        } else {
+                pte = ptep_get_and_clear(mm, addr, ptep);
+        }
+        return pte;
+}
+
 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
         clear_bit(_PAGE_BIT_RW, &ptep->pte_low);
 }
 
 /*
+ * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
+ *
+ *  dst - pointer to pgd range anwhere on a pgd page
+ *  src - ""
+ *  count - the number of pgds to copy.
+ *
+ * dst and src can be on the same page, but the range must not overlap,
+ * and must not cross a page boundary.
+ */
+static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
+{
+       memcpy(dst, src, count * sizeof(pgd_t));
+}
+
+/*
  * Macro to mark a page protection value as "uncacheable".  On processors which do not support
  * it, this is a no-op.
  */
@@ -415,6 +444,7 @@ extern void noexec_setup(const char *str);
 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 #define __HAVE_ARCH_PTE_SAME
 #include <asm-generic/pgtable.h>